Erreurs d'affichages

Hello everybody ! Since 4 days i’ve a problem with a site. The screen have items that appear and disappear everytime when i’m working on this project. Can you explain to me please ?
https://preview.webflow.com/preview/meme-germaine?utm_medium=preview_link&utm_source=designer&utm_content=meme-germaine&preview=2e02b065ad82e018f6cc9aa2fd73dcf6&mode=preview